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configure: conditionally enable pedantic-errors

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Enable pedantic-errors for GCC >= 5 with --enable-werror. Before GCC 5,
pedantic-errors was synonymous to -Werror=pedantic [0], which is still
the case for clang [1]. With GCC 5, it became complementary [2].

Also fix a resulting error in acinclude.m4 as main's return type was
missing, which is illegal in C99.

[0] https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/Warning-Options.html
[1] https://clang.llvm.org/docs/UsersManual.html#options-to-control-error-and-warning-messages
[2] https://gcc.gnu.org/onlinedocs/gcc-5.1.0/gcc/Warning-Options.html

Closes https://github.com/curl/curl/pull/2747
This commit is contained in:
Marcel Raad 2018-07-09 18:38:23 +02:00
parent a829c4b25e
commit d5c0351055
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GPG Key ID: 33C416EFAE4D6F02
2 changed files with 8 additions and 1 deletions
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2
acinclude.m4
View File

@ -2158,7 +2158,7 @@ AC_DEFUN([CURL_VERIFY_RUNTIMELIBS], [
dnl point also is available run-time!
AC_MSG_CHECKING([run-time libs availability])
CURL_RUN_IFELSE([
main()
int main()
{
return 0;
}

7
configure.ac
View File

@ -61,6 +61,13 @@ AC_SUBST(CONFIGURE_OPTIONS)
CURL_CFLAG_EXTRAS=""
if test X"$want_werror" = Xyes; then
CURL_CFLAG_EXTRAS="-Werror"
if test "$compiler_id" = "GNU_C"; then
dnl enable -pedantic-errors for GCC 5 and later,
dnl as before that it was the same as -Werror=pedantic
if test "$compiler_num" -ge "500"; then
CURL_CFLAG_EXTRAS="$CURL_CFLAG_EXTRAS -pedantic-errors"
fi
fi
fi
AC_SUBST(CURL_CFLAG_EXTRAS)