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configure: Test GCC-specific compiler flags only when using GCC

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Commit 23373d01d "configure: Test compiler flags" (v4.4.0) made
configure test whether compiler flags work, to let us use flags that
work only for some compilers.

Unfortunately, the Sun C compiler accepts invalid options with a
warning, breaking the test.  Observed on Solaris 10.

Fix by testing the compiler flags only when AC_PROG_CC detected GCC.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
This commit is contained in:
Markus Armbruster 2020-12-28 05:07:50 +01:00
parent 6cff488537
commit 13362acc46
1 changed files with 5 additions and 0 deletions
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5
configure.ac
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@ -91,6 +91,9 @@ MY_WITH_READLINE
### Checks for typedefs, structures, and compiler characteristics ### Checks for typedefs, structures, and compiler characteristics
if test "$GCC"
then
# Enable useful warnings # Enable useful warnings
# Some of them are commented out because the code needs cleanup first # Some of them are commented out because the code needs cleanup first
# Clang needs to be tested with -Werror=unknown-warning-option # Clang needs to be tested with -Werror=unknown-warning-option
@ -168,6 +171,8 @@ main(int argc, char *argv[])
} }
]])]) ]])])
fi # $GCC
### Checks for library functions ### Checks for library functions