re PR target/38904 (Shared libgcc DLL violates Cygwin platform conventions.)

	PR target/38904
	* mkmap-flat.awk (END):  Use pe_dll command-line arg to pass
	LIBRARY name in, instead of hard-coding it.
	* config.gcc (i[34567]86-*-pe | i[34567]86-*-cygwin*):  Add an
	extra target make frag to tmake_files according to EH model.
	(i[34567]86-*-mingw* | x86_64-*-mingw*):  Likewise.
	* config/i386/t-dw2-eh, config/i386/t-sjlj-eh:  Add new target
	frags that define makefile variable EH_MODEL appropriately.
	* config/i386/cygming.h (DWARF2_UNWIND_INFO):  Add comment.
	* config/i386/cygwin.h (LIBGCC_EH_EXTN):  Define to nothing or
	to "-sjlj" according to type of EH configured.
	(LIBGCC_SONAME):  Concatenate it to shared library base name.
	* config/i386/mingw32.h (LIBGCC_EH_EXTN):  Define to "_dw2" or
	to "_sjlj" according to type of EH configured.
	(LIBGCC_SONAME):  Concatenate it to shared library base name.
	* config/i386/t-cygming (SHLIB_SONAME):  Use EH_MODEL.
	(SHLIB_LINK):  Add missing semicolon to if-else construct.
	(SHLIB_MKMAP_OPTS):  Pass library name to mkmap-flat.awk as
	string value of "pe_dll" command-line option.
	* config/i386/t-cygwin (SHLIB_EH_EXTENSION):  New helper.
	(SHLIB_SONAME):  Use it when overriding t-cygming default.
	(SHLIB_IMPLIB):  Override t-cygming default.
	(SHLIB_MKMAP_OPTS):  Pass library name to mkmap-flat.awk as
	string value of "pe_dll" command-line option.

From-SVN: r143829

7 files changed, 42 insertions, 6 deletions

diff --git a/gcc/config/i386/cygming.h b/gcc/config/i386/cygming.h
index 062b50a..e9250bb 100644
--- a/gcc/config/i386/cygming.h
+++ b/gcc/config/i386/cygming.h
@@ -283,6 +283,8 @@ do {						\
 /* If configured with --disable-sjlj-exceptions, use DWARF2, else
    default to SJLJ.  */
 #if  (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS)
+/* The logic of this #if must be kept synchronised with the logic
+   for selecting the tmake_eh_file fragment in config.gcc.  */
 #define DWARF2_UNWIND_INFO 1
 #else
 #define DWARF2_UNWIND_INFO 0
diff --git a/gcc/config/i386/cygwin.h b/gcc/config/i386/cygwin.h
index 9b2fd7f..0f73f00 100644
--- a/gcc/config/i386/cygwin.h
+++ b/gcc/config/i386/cygwin.h
@@ -259,3 +259,11 @@ while (0)
    and the -pthread flag is not recognized.  */
 #undef GOMP_SELF_SPECS
 #define GOMP_SELF_SPECS ""
+
+/* This matches SHLIB_SONAME and SHLIB_SOVERSION in t-cygwin. */
+#if DWARF2_UNWIND_INFO
+#define LIBGCC_EH_EXTN ""
+#else
+#define LIBGCC_EH_EXTN "-sjlj"
+#endif
+#define LIBGCC_SONAME "cyggcc_s" LIBGCC_EH_EXTN "-1.dll"
diff --git a/gcc/config/i386/mingw32.h b/gcc/config/i386/mingw32.h
index 571277e..43f5a05 100644
--- a/gcc/config/i386/mingw32.h
+++ b/gcc/config/i386/mingw32.h
@@ -212,4 +212,10 @@ __enable_execute_stack (void *addr)					\
 #endif
 
 /* This matches SHLIB_SONAME and SHLIB_SOVERSION in t-cygming. */
-#define LIBGCC_SONAME "libgcc_s_1.dll"
+/* This matches SHLIB_SONAME and SHLIB_SOVERSION in t-cygwin. */
+#if DWARF2_UNWIND_INFO
+#define LIBGCC_EH_EXTN "_dw2"
+#else
+#define LIBGCC_EH_EXTN "_sjlj"
+#endif
+#define LIBGCC_SONAME "libgcc_s" LIBGCC_EH_EXTN "-1.dll"
diff --git a/gcc/config/i386/t-cygming b/gcc/config/i386/t-cygming
index 5efd82e..e26462f 100644
--- a/gcc/config/i386/t-cygming
+++ b/gcc/config/i386/t-cygming
@@ -43,13 +43,13 @@ STMP_FIXINC=stmp-fixinc
 # mkmap-flat.awk is used with the pe_dll option to produce a DEF instead
 # of an ELF map file.
 #
-# Warning: If SHLIB_SOVERSION or SHLIB_SONAME is updated, LIBGCC_SONAME
-# in mingw32.h must be updated also.
+# Warning: If SHLIB_SOVERSION or SHLIB_SONAME are updated, LIBGCC_SONAME
+# in mingw32.h and SHLIB_MKMAP_OPTS below must be updated also.
 
 SHLIB_EXT = .dll
 SHLIB_IMPLIB = @shlib_base_name@.a
 SHLIB_SOVERSION = 1
-SHLIB_SONAME = @shlib_base_name@_$(SHLIB_SOVERSION)$(SHLIB_EXT)
+SHLIB_SONAME = @shlib_base_name@_$(EH_MODEL)-$(SHLIB_SOVERSION)$(SHLIB_EXT)
 SHLIB_MAP = @shlib_map_file@
 SHLIB_OBJS = @shlib_objs@
 SHLIB_DIR = @multilib_dir@/shlib
@@ -57,7 +57,7 @@ SHLIB_SLIBDIR_QUAL = @shlib_slibdir_qual@
 
 SHLIB_LINK = $(LN_S) -f $(SHLIB_MAP) $(SHLIB_MAP).def && \
 	if [ ! -d $(SHLIB_DIR) ]; then \
-		mkdir $(SHLIB_DIR) \
+		mkdir $(SHLIB_DIR); \
 	else true; fi && \
 	$(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) -shared -nodefaultlibs \
 	$(SHLIB_MAP).def \
@@ -79,5 +79,7 @@ SHLIB_INSTALL = \
 	$(INSTALL_DATA) $(SHLIB_DIR)/$(SHLIB_IMPLIB) \
 	  $$(DESTDIR)$$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIB_IMPLIB)
 SHLIB_MKMAP = $(srcdir)/mkmap-flat.awk
-SHLIB_MKMAP_OPTS = -v pe_dll=1
+# We'd like to use SHLIB_SONAME here too, but shlib_base_name
+# does not get substituted before mkmap-flat.awk is run.
+SHLIB_MKMAP_OPTS = -v pe_dll=libgcc_s_$(EH_MODEL)-$(SHLIB_SOVERSION)$(SHLIB_EXT)
 SHLIB_MAPFILES = $(srcdir)/libgcc-std.ver
diff --git a/gcc/config/i386/t-cygwin b/gcc/config/i386/t-cygwin
index 7433138..d58d84f 100644
--- a/gcc/config/i386/t-cygwin
+++ b/gcc/config/i386/t-cygwin
@@ -16,3 +16,15 @@ cygwin2.o: $(srcdir)/config/i386/cygwin2.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
 
 # Cygwin-specific parts of LIB_SPEC
 SHLIB_LC = -lcygwin -luser32 -lkernel32 -ladvapi32 -lshell32
+
+# We have already included one of the t-{dw2,sjlj}-eh fragments for EH_MODEL
+SHLIB_EH_EXTENSION = $(subst -dw2,,-$(EH_MODEL))
+
+# Cygwin uses different conventions than MinGW; override generic SHLIB_ def'ns here.
+SHLIB_IMPLIB = @shlib_base_name@$(SHLIB_EXT).a
+SHLIB_SONAME = cyggcc_s$(SHLIB_EH_EXTENSION)-$(SHLIB_SOVERSION)$(SHLIB_EXT)
+# This must match the definitions of SHLIB_SONAME/SHLIB_SOVERSION and LIBGCC_SONAME.
+# We'd like to use SHLIB_SONAME here too, and we can, since
+# we don't rely on shlib_base_name substitution for it.
+SHLIB_MKMAP_OPTS = -v pe_dll=$(SHLIB_SONAME)
+
diff --git a/gcc/config/i386/t-dw2-eh b/gcc/config/i386/t-dw2-eh
new file mode 100644
index 0000000..ffcc39a
--- /dev/null
+++ b/gcc/config/i386/t-dw2-eh
@@ -0,0 +1,3 @@
+
+# We are using Dwarf-2 EH.
+EH_MODEL = dw2
diff --git a/gcc/config/i386/t-sjlj-eh b/gcc/config/i386/t-sjlj-eh
new file mode 100644
index 0000000..c9085f4
--- /dev/null
+++ b/gcc/config/i386/t-sjlj-eh
@@ -0,0 +1,3 @@
+
+# We are using SjLj EH.
+EH_MODEL = sjlj