8325881: Require minimum gcc version 10

Reviewed-by: ihse, shade

Author: Kim Barrett

doc/building.html

@@ -601,7 +601,7 @@ <h2 id="native-compiler-toolchain-requirements">Native Compiler
 <p>All compilers are expected to be able to handle the C11 language
 standard for C, and C++14 for C++.</p>
 <h3 id="gcc">gcc</h3>
-<p>The minimum accepted version of gcc is 6.0. Older versions will not
+<p>The minimum accepted version of gcc is 10.0. Older versions will not
 be accepted by <code>configure</code>.</p>
 <p>The JDK is currently known to compile successfully with gcc version
 13.2 or newer.</p>

doc/building.md

@@ -403,7 +403,7 @@ C, and C++14 for C++.
 
 ### gcc
 
-The minimum accepted version of gcc is 6.0. Older versions will not be accepted
+The minimum accepted version of gcc is 10.0. Older versions will not be accepted
 by `configure`.
 
 The JDK is currently known to compile successfully with gcc version 13.2 or

make/autoconf/toolchain.m4

@@ -51,7 +51,7 @@ TOOLCHAIN_DESCRIPTION_xlc="IBM XL C/C++"
 
 # Minimum supported versions, empty means unspecified
 TOOLCHAIN_MINIMUM_VERSION_clang="3.5"
-TOOLCHAIN_MINIMUM_VERSION_gcc="6.0"
+TOOLCHAIN_MINIMUM_VERSION_gcc="10.0"
 TOOLCHAIN_MINIMUM_VERSION_microsoft="19.28.0.0" # VS2019 16.8, aka MSVC 14.28
 TOOLCHAIN_MINIMUM_VERSION_xlc="16.1.0.0011"