build: fix compiler version detection

Compiler version tuples should be numeric for tuple comparisons
to work.
Also correct check for AIX where the minimum supported GCC is 6.3.0
PR-URL: #24879
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Author: richardlau

configure.py

@@ -654,8 +654,8 @@ def try_check_compiler(cc, lang):
 
 values= (proc.communicate()[0].split() + ['0'] *7)[0:7]
 is_clang=values[0] =='1'
-gcc_version=tuple(values[1:1+3])
-clang_version=tuple(values[4:4+3])
+gcc_version=tuple(map(int, values[1:1+3]))
+clang_version=tuple(map(int, values[4:4+3])) ifis_clangelseNone
 
 return (True, is_clang, clang_version, gcc_version)
 
@@ -752,6 +752,8 @@ def check_compiler(o):
 ok, is_clang, clang_version, gcc_version=try_check_compiler(CXX, 'c++')
 ifnotok:
 warn('failed to autodetect C++ compiler version (CXX=%s)'%CXX)
+elifsys.platform.startswith('aix') andgcc_version< (6, 3, 0):
+warn('C++ compiler too old, need g++ 6.3.0 (CXX=%s)'%CXX)
 elifclang_version< (3, 4, 2) ifis_clangelsegcc_version< (4, 9, 4):
 warn('C++ compiler too old, need g++ 4.9.4 or clang++ 3.4.2 (CXX=%s)'%CXX)
 
@@ -920,8 +922,7 @@ def gcc_version_ge(version_checked):
 forcompilerin [(CC, 'c'), (CXX, 'c++')]:
 ok, is_clang, clang_version, compiler_version= \
 try_check_compiler(compiler[0], compiler[1])
-compiler_version_num=tuple(map(int, compiler_version))
-ifis_clangorcompiler_version_num<version_checked:
+ifis_clangorcompiler_version<version_checked:
 returnFalse
 returnTrue