autotools: Only probe for SGI MIPS compilers on IRIX

MIPSPro and the predecessor compiler which was part of the IDO (IRIS
Development Option) were only ever shipped on the SGI IRIX operating
system (with MIPSPro on 6.0+ which was released in 1994).  Limit the
autoconf check to IRIX when probing for these compilers to save some
cycles on other platforms.

Closes: #13611
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 9a4547709eb1cdc86e3f7ee908cd11a5fcf00ea9..06e335d8faa2a3d1812ee8e8258c100647ff74fd 100644 (file)
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -48,8 +48,12 @@ AC_DEFUN([CURL_CHECK_COMPILER], [
   CURL_CHECK_COMPILER_INTEL_C
   CURL_CHECK_COMPILER_CLANG
   CURL_CHECK_COMPILER_GNU_C
-  CURL_CHECK_COMPILER_SGI_MIPSPRO_C
-  CURL_CHECK_COMPILER_SGI_MIPS_C
+  case $host in
+    mips-sgi-irix*)
+      CURL_CHECK_COMPILER_SGI_MIPSPRO_C
+      CURL_CHECK_COMPILER_SGI_MIPS_C
+    ;;
+  esac
   CURL_CHECK_COMPILER_SUNPRO_C
   CURL_CHECK_COMPILER_TINY_C
   #