configure.ac: fix bashisms in configure.ac

configure scripts need to be runnable with a POSIX-compliant /bin/sh.

On many (but not all!) systems, /bin/sh is provided by Bash, so errors
like this aren't spotted. Notably Debian defaults to /bin/sh provided
by dash which doesn't tolerate such bashisms as '=='.

This retains compatibility with bash.

Fixes configure warnings/errors like:
```
checking if compiler warns about alias for function with incompatible types... yes
/var/tmp/portage/sys-libs/glibc-2.34-r10/work/glibc-2.34/configure: 4209: test: xyes: unexpected operator
```

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Signed-off-by: Sam James <sam@gentoo.org>

4 files changed, 4 insertions, 4 deletions

diff --git a/sysdeps/powerpc/powerpc64/le/configure b/sysdeps/powerpc/powerpc64/le/configure
index 35950a6..395f9f7 100644
--- a/sysdeps/powerpc/powerpc64/le/configure
+++ b/sysdeps/powerpc/powerpc64/le/configure
@@ -113,7 +113,7 @@ CFLAGS="$save_CFLAGS"
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_compiler_powerpc64le_ldbl128_mabi" >&5
 $as_echo "$libc_cv_compiler_powerpc64le_ldbl128_mabi" >&6; }
-if test "$libc_cv_compiler_powerpc64le_ldbl128_mabi" == "no"; then :
+if test "$libc_cv_compiler_powerpc64le_ldbl128_mabi" = "no"; then :
   critic_missing="$critic_missing The compiler must support -mabi=ieeelongdouble and -mlong-double-128 simultaneously."
 fi
 
diff --git a/sysdeps/powerpc/powerpc64/le/configure.ac b/sysdeps/powerpc/powerpc64/le/configure.ac
index 9f0423e..48d7089 100644
--- a/sysdeps/powerpc/powerpc64/le/configure.ac
+++ b/sysdeps/powerpc/powerpc64/le/configure.ac
@@ -63,7 +63,7 @@ long double x;
 		  [libc_cv_compiler_powerpc64le_ldbl128_mabi=yes],
 		  [libc_cv_compiler_powerpc64le_ldbl128_mabi=no])
 CFLAGS="$save_CFLAGS"])
-AS_IF([test "$libc_cv_compiler_powerpc64le_ldbl128_mabi" == "no"],
+AS_IF([test "$libc_cv_compiler_powerpc64le_ldbl128_mabi" = "no"],
       [critic_missing="$critic_missing The compiler must support -mabi=ieeelongdouble and -mlong-double-128 simultaneously."])
 
 dnl objcopy (binutils) 2.26 or newer required to support the --update-section
diff --git a/sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure
index 4ca1d15..b95a720 100644
--- a/sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure
+++ b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure
@@ -25,7 +25,7 @@ fi
 $as_echo "$libc_cv_mcpu_power10" >&6; }
 config_vars="$config_vars
 mcpu-power10 = $libc_cv_mcpu_power10"
-if test "$libc_cv_mcpu_power10" == "yes"; then :
+if test "$libc_cv_mcpu_power10" = "yes"; then :
 
 	$as_echo "#define USE_PPC64_MCPU_POWER10 1" >>confdefs.h
 
diff --git a/sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure.ac b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure.ac
index ceb578c..257ca6c 100644
--- a/sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure.ac
+++ b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure.ac
@@ -9,6 +9,6 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 	       [libc_cv_mcpu_power10=yes],
 	       [libc_cv_mcpu_power10=no])])
 LIBC_CONFIG_VAR([mcpu-power10], [$libc_cv_mcpu_power10])
-AS_IF([[test "$libc_cv_mcpu_power10" == "yes"]],[
+AS_IF([[test "$libc_cv_mcpu_power10" = "yes"]],[
 	AC_DEFINE(USE_PPC64_MCPU_POWER10)])
 CFLAGS="$OLD_CFLAGS"