diff options
Diffstat (limited to 'gcc/gcc.cc')
| -rw-r--r-- | gcc/gcc.cc | 56 |
1 files changed, 56 insertions, 0 deletions
@@ -47,6 +47,9 @@ compilation is specified by a string called a "spec". */ #include "opts-jobserver.h" #include "common/common-target.h" +#ifndef MATH_LIBRARY +#define MATH_LIBRARY "m" +#endif /* Manage the manipulation of env vars. @@ -4117,6 +4120,48 @@ next_item: } } +/* Forward certain options to offloading compilation. */ + +static void +forward_offload_option (size_t opt_index, const char *arg, bool validated) +{ + switch (opt_index) + { + case OPT_l: + /* Use a '_GCC_' prefix and standard name ('-l_GCC_m' irrespective of the + host's 'MATH_LIBRARY', for example), so that the 'mkoffload's can tell + this has been synthesized here, and translate/drop as necessary. */ + /* Note that certain libraries ('-lc', '-lgcc', '-lgomp', for example) + are injected by default in offloading compilation, and therefore not + forwarded here. */ + /* GCC libraries. */ + if (/* '-lgfortran' */ strcmp (arg, "gfortran") == 0 ) + save_switch (concat ("-foffload-options=-l_GCC_", arg, NULL), + 0, NULL, validated, true); + /* Other libraries. */ + else + { + /* The case will need special consideration where on the host + '!need_math', but for offloading compilation still need + '-foffload-options=-l_GCC_m'. The problem is that we don't get + here anything like '-lm', because it's not synthesized in + 'gcc/fortran/gfortranspec.cc:lang_specific_driver', for example. + Generally synthesizing '-foffload-options=-l_GCC_m' etc. in the + language specific drivers is non-trivial, needs very careful + review of their options handling. However, this issue is not + actually relevant for the current set of supported host/offloading + configurations. */ + int need_math = (MATH_LIBRARY[0] != '\0'); + if (/* '-lm' */ (need_math && strcmp (arg, MATH_LIBRARY) == 0)) + save_switch ("-foffload-options=-l_GCC_m", + 0, NULL, validated, true); + } + break; + default: + gcc_unreachable (); + } +} + /* Handle a driver option; arguments and return value as for handle_option. */ @@ -4375,6 +4420,17 @@ driver_handle_option (struct gcc_options *opts, /* POSIX allows separation of -l and the lib arg; canonicalize by concatenating -l with its arg */ add_infile (concat ("-l", arg, NULL), "*"); + + /* Forward to offloading compilation '-l[...]' flags for standard, + well-known libraries. */ + /* Doing this processing here means that we don't get to see libraries + injected via specs, such as '-lquadmath' injected via + '[build]/[target]/libgfortran/libgfortran.spec'. However, this issue + is not actually relevant for the current set of host/offloading + configurations. */ + if (ENABLE_OFFLOADING) + forward_offload_option (opt_index, arg, validated); + do_save = false; break; |